EP0157985A2 - Verfahren und Vorrichtung zum elektroerosiven Schneiden mit einer durch eine Stange gestützten Bandelektrode - Google Patents

Verfahren und Vorrichtung zum elektroerosiven Schneiden mit einer durch eine Stange gestützten Bandelektrode Download PDF

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Publication number
EP0157985A2
EP0157985A2 EP84308920A EP84308920A EP0157985A2 EP 0157985 A2 EP0157985 A2 EP 0157985A2 EP 84308920 A EP84308920 A EP 84308920A EP 84308920 A EP84308920 A EP 84308920A EP 0157985 A2 EP0157985 A2 EP 0157985A2
Authority
EP
European Patent Office
Prior art keywords
tape
workpiece
bar
electrode
takeup
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP84308920A
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English (en)
French (fr)
Other versions
EP0157985A3 (de
Inventor
Kiyoshi Inoue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Inoue Japax Research Inc
Original Assignee
Inoue Japax Research Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP23795883A external-priority patent/JPS60131119A/ja
Priority claimed from JP23982483A external-priority patent/JPS60135124A/ja
Application filed by Inoue Japax Research Inc filed Critical Inoue Japax Research Inc
Publication of EP0157985A2 publication Critical patent/EP0157985A2/de
Publication of EP0157985A3 publication Critical patent/EP0157985A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/02—Wire-cutting

Definitions

  • the present invention relates to tape-cut electroerosion and, more particularly, to a method of and apparatus for cutting an electrically conductive workpiece with a traveling tape electrode.
  • Wire-cut electroerosion also called traveling-wire electroerosion
  • traveling-wire electroerosion is well known in which an electrode wire axially advancing from a wire dispensing site to a wire takeup site is supported by a pair of wire guide members disposed at opposite sides of a workpiece. These guide members are provided to establish a straight-line path which traverses the workpiece and along which the wire is desired to travel to provide a renewing elongate electrode surface for electroerosively cutting the workpiece along a programmed cutting path in a plane transverse to the renewing electrode surface.
  • the renewing electrode surface must be of high straightness to assure due electroerosive cutting accuracy, it has been found that the wire in the cutting zone tends to bend backwards and uncontrolledly fluctuate in position due to a machining pressure that develops in the erosion gap, thus limiting the cutting accuracy obtainable. Furthermore, the wire, so thin as 0 .5 mm or less in all sectional directions, inherently breaks once some excessive thermal stress concentrates in the cutting zone.
  • a tape-form electrode may be employed to provide a breakage-free traveling-electrode cutting operation.
  • the electrode tape when oriented to make its width in alignment with a cutting direction, the electrode tape is highly resistant to deflection and mispositioning..When the cutting direction changes, however, the tape must be inclined and such positioning stability of the tape is no longer the case. Since the erosion gap then lies defining with one lateral surface of the tape, the tape tends to deflect backwards.
  • a tape-form electrode gives rise to substantially greater advantages than a wire-form electrode as used in traveling-wire electroerosive cutting operations, it has been found that there still remain severe limitations in improving the cutting accuracy and efficiency achievable in those operations.
  • the present invention seeks to provide a new and improved tape-cut electroerosion method and apparatus utilizing a traveling tape electrode.
  • a method of cutting an electrically conductive workpiece with an electrode tape comprises: advancing the electrode tape from a tape dispensing site towards a tape takeup site; guiding the advancing tape in a continuous tape travel path between the dispensing site and the takeup site by means of a rigid, straight bar penetrating the workpiece from one side to the other side thereof so that the tape advancing longitudinally engages two opposite, elongate side surfaces of the bar which extend parallel to its longitudinal axis and that portions of the advancing tape respectively in longitudinal engagement with the said elongate side surfaces together form a renewing elongate electrode surface of convexity essentially V-shaped in cross section and spacedly juxtaposed with the workpiece across a fluid flushed machining gap; and relatively displacing the bar and the workpiece in a plane transverse to the said longitudinal axis while passing an electroerosive machining current between the said electrode surface and the workpiece across the gap to
  • the tape dispensing site and the tape takeup site are both disposed at the said one side of the workpiece and the said two opposite, elongate side surfaces define generally parallel portions of the continuous tape travel path which bidirectionally traverses the workpiece.
  • the tape takeup site is disposed at the said other side while the tape dispensing site is disposed at the said one side of the workpiece, and the electrode tape is folded about its longitudinal center line to bring the tape into engagement with the said two opposite, elongate side surfaces of the bar in the workpiece.
  • the said bar is rotatable with a variable angle of rotation about the said longitudinal axis, the method further comprising changing the angle of rotation of the bar to change the direction in which the apex of said machining surface is oriented during the material removal being advanced.
  • the invention also provides, in a second aspect thereof, an apparatus for cutting an electrically conductive workpiece with an electrode tape, which comprises: a tape dispensing means; a tape takeup means; means for advancing the electrode tape from the dispensing means towards the takeup means; a tape guiding system comprising a rigid, straight bar adapted to penetrate the workpiece from one side to the other side thereof for guiding the advancing tape in a continuous tape travel path between the dispensing means and the takeup means so that the advancing tape longitudinally engages two opposite, elongate side surfaces of the bar extending parallel to its longitudinal axis and that portions of the advancing tape respectively in longitudinal engagement with the said elongate side surfaces together form a renewing-elongate electrode face of convexity essentially V-shaped in cross section and spacedly juxtaposed with the workpiece across a fluid flushed machining gap; and
  • the tape dispensing means and the tape takeup means may be both disposed at said the one side of the workpiece so that the said two opposite, elongate side surfaces define generally parallel portions of the continuous tape travel path which bidirectionally traverses the workpiece.
  • the tape takeup means may be disposed at the said other side while the tape dispensing means is disposed at said one side of the workpiece, the apparatus further comprising means for folding the electrode tape about its longitudinal center line to bring the tape into engagement on the said two opposite, elongate side surfaces of the bar in the workpiece.
  • the said bar is rotatable with a variable angle of rotation about the said longitudinal axis, the apparatus further comprising means for changing the range rotation of the bar to change the direction in which the apex of the said machining face is oriented during the material removal being advanced.
  • FIGS. 1 - 3 there is shown an improved system for electroerosively cutting an electrically conductive workpiece 1 with a continuous electrode tape 2 which is advanced from a tape supply reel 3 towards a tape collection reel 4.
  • the supply and collection reels 3 and 4 are both mounted on a common carriage 5 which is disposed at the upper side of the workpiece 1.
  • the electrode tape 2 is dispensed from the supply reel 3 and advanced along a continuous path of travel by a driving capstan and pinch roller unit 6, the path terminating at the collection reel 4.
  • a braking roller unit 7 is provided to apply a tension to the advancing tape 2.
  • the units 6 and 7 are mounted on the carriage 5,
  • the tape 2 between the braking unit 7 and the drive unit 6 is supported by a guide system which includes a rigid straight bar 8 vertically penetrating the workpiece 1 from the upper side to the lower side thereof and terminating at a guide roller 9.
  • the tape 2 is supported by the bar 8 so that it longitudinally engages two opposite, elongate side surfaces 8a and 8b of the bar which extends parallel to a longitudinal axis 8c thereof and that portions 2a and 2b of the advancing tape 2 respectively in longitudinal engagement with the bar surfaces 8a and 8b form a renewing elongate electrode face of convexity generally V-shaped in cross-section and juxtaposed with the workpiece 1 across the fluid-filled machining gap.
  • the two opposite, elongate side surfaces 8a and 8b of the bar 8 define parallel portions of the continuous tape travel path which bidirectionally transverses the workpiece 1.
  • two pairs of guide rollers 10a, lOb; and lla, llb are arranged at the upper and lower sides of the workpiece 1, respectively, to hold these traveling portions 2a and 2b of the tape 2 in firm engagement with the supporting surfaces 8a and 8b, respectively.
  • the vertical guide bar 8 is securely supported by support member 12 which in turn is securely mounted on the carriage 5.
  • the carriage 5 also carries a fluid delivery unit 13 in the form of a nozzle longitudinally traversed by the guide bar 8 and the tape portions 2a and 2b moving in engagement therewith.
  • the nozzle 13 has an inlet conduit 13a communicating with a source of the machining fluid and an outlet nozzle opening 13b adjacent the upper surface of the workpiece 1 for supplying the machining fluid into the cutting zone in the workpiece.
  • a machining power supply 14 has one terminal electrically connected to the workpiece 1 and the other terminal guide roller 10b as shown for passing an electroerosive machining current between the renewing machining surface 2a, 2b, and the across the fluid-filled erosion gap to remove material from the workpiece 1.
  • the material removal is continued as the machining surface 2a, 2b and the workpiece are relatively displaced in a plane (X - Y) orthogonal or transverse to the bar 8.
  • the workpiece 1 is arranged to be displaceable while the bar axis 8c is stationary.
  • the workpiece 1 is thus securely mounted on a compound worktable 15 which is movably supported on a machine base 16.
  • the worktable 15 is displaced in the X - Y plane by means of a pair of motors 17 (Mx) and 18 (My) controlledly driven by command signals furnished from an NC unit 19.
  • the drive command signals are produced in the control unit 19 from path data for the bar axis 8c to be translationally displaced relative to the workpiece 1, which data are in turn derived from geometrical data defining a contour of cut to be formed in the workpiece 1.
  • the V-shaped machining surface 2a, 2b firmly supported by the bar surfaces 8a, 8b can be effectively displaced simply translationally along the prescribed path in a given coordinate system to progressively generate the desired contour of cut in the workpiece 1 with at least a portion of the renewing surface 2a, 2b at each cutting block.
  • the carriage 5 supporting the bar 8 (as well as the reels 3 and 4 etc) is supported on a machine frame 20 rotatably about a rotary axis 21 which is advantageously coincident with the axis 8c of the bar 8.
  • the carriage 5 and hence the bar 8 is rotated about the vertical axis 21, 8c by a motor 21 in response to a command signal from the NC unit 19 so as to change the orientation of apex of the V-shaped machining surface 2a, 2b from a previous programmed direction to a next programmed direction where a change in the orientation is required on the programmed path of translational displacement of the bar axis 8c.
  • the takeup reel 4 and the tape drive unit 6 may be disposed at the other side (e.g. lower) of the workpiece 1 while the supply reel 3 and the tape braking unit 7 are disposed at one side (e.g. upper) of the workpiece 1 so that the tape 2 dispensed traverses the workpiece unidirectionally (from up to down). Then, the guide roller 9 is removed.
  • the brake unit 7 and the guide rollers 10a, 10b there is provided means for folding the dispensed tape 2 about its longitudinal center line to bring the tape into engagement with the two opposite, elongate side surfaces 8a, 8b of the guide bar 8 so that portions 2a, 2b of the folded tape moving respectively in engagement with these surfaces 8a, 8b together form a V-shaped machining electrode surface.
  • the pairs of the guide rollers 10a, lOb; lla, 11b serve to hold the traveling (here unidirectionally) tape portions 2a, 2b in firm engagement with the opposite two supporting surfaces 8a, 8b of the guide bar 8.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
EP84308920A 1983-12-19 1984-12-19 Verfahren und Vorrichtung zum elektroerosiven Schneiden mit einer durch eine Stange gestützten Bandelektrode Withdrawn EP0157985A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP23795883A JPS60131119A (ja) 1983-12-19 1983-12-19 放電加工装置
JP237958/83 1983-12-19
JP239824/83 1983-12-21
JP23982483A JPS60135124A (ja) 1983-12-21 1983-12-21 放電加工装置

Publications (2)

Publication Number Publication Date
EP0157985A2 true EP0157985A2 (de) 1985-10-16
EP0157985A3 EP0157985A3 (de) 1986-09-24

Family

ID=26533455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84308920A Withdrawn EP0157985A3 (de) 1983-12-19 1984-12-19 Verfahren und Vorrichtung zum elektroerosiven Schneiden mit einer durch eine Stange gestützten Bandelektrode

Country Status (3)

Country Link
US (1) US4629855A (de)
EP (1) EP0157985A3 (de)
DE (1) DE157985T1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60255316A (ja) * 1984-05-28 1985-12-17 Mitsubishi Electric Corp ワイヤカツト放電加工装置
US4743729A (en) * 1987-07-06 1988-05-10 Westinghouse Electric Corp. Apparatus for electrical discharge machining of a circumferential section from a bore in a metallic cylinder
DE19540351C1 (de) * 1995-10-28 1997-05-28 Charmilles Technologies Drahtelektrode zum funkenerosiven Schneiden
US6225589B1 (en) 1999-03-15 2001-05-01 Stephen Bartok Electric discharge machining apparatus
US8963040B2 (en) 2010-04-28 2015-02-24 Perfect Point Edm Corporation Method of separating fastener shanks from heads or frames

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2802929A (en) * 1953-10-20 1957-08-13 Spareatron Ltd Methods and apparatus for surface grinding materials
US2903557A (en) * 1957-12-26 1959-09-08 Elox Corp Michigan Arc machining with band electrode
US3035150A (en) * 1960-02-19 1962-05-15 Continental Machines Method of cutting thin-walled cellular or honeycombed metal
SU139913A1 (ru) * 1960-12-10 1961-11-30 Г.И. Алкин Инструмент дл электроэрозионной обработки
FR2371267A1 (fr) * 1976-11-19 1978-06-16 Charmilles Sa Ateliers Procede et dispositif pour l'usinage par etincelage erosif
GB1587787A (en) * 1977-04-18 1981-04-08 Inoue Japax Res Electroerosion machining apparatus and methods
US4386248A (en) * 1978-10-06 1983-05-31 Inoue-Japax Research Incorporated Electrical machining method and apparatus for forming a 3D surface contour in a workpiece with a traveling-wire electrode
GB2032320B (en) * 1978-10-06 1982-10-13 Inoue Japax Res Electrical machining apparatus and method for producing three-dimensional surface contours

Also Published As

Publication number Publication date
US4629855A (en) 1986-12-16
DE157985T1 (de) 1986-02-27
EP0157985A3 (de) 1986-09-24

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